What is it about couriers that make them turn up at my door just as I'm getting in or out of the bath? I can't be the only one who has answered my front door half naked. Whether that's a perk of the job or a moment of peril isn't for me to judge, but it livens their day up, no doubt.

Rotorumpus hands you the opportunity to be a courier, albeit without the opportunity to view recipients in the buff. This is the art of couriering in the future: white cubic cargo transported between other cubes to get to the goal, a throbbing green cube.

Movement can only be undertaken under strict conditions. As explained very clearly by your boss, the bizarrely plain-named Sarah, your cube can only be moved when it's in line with other cubes.

Rotorumpus occurs in a 3D space where cubes are effectively placed in an invisible grid. Play is never a question of searching out just which cubes you can fling your own towards (those that are available are lit up like lanterns), but rather a case of choosing the right cube.

Early levels are nothing more than lessons in toeing the line, zipping from cube to cube until you find the way to the exit.

As you progress through the game's twenty levels spread across four stages, greater care is needed. Choosing the right block to fly towards, bearing in mind that you can't go back once you've made your move, is the eternal problem.

This involves a great deal of planning ahead, casting your eye over the map's entirety to plan your route before actually undertaking it.

Doing so is as simple as you might expect. Rotorumpus uses the touchscreen intuitively for zooming in and out, as well as twirling the camera at every odd angle. Move your fingers across the screen and the view responds as you like.

Being able to take a look at what's to come is essential, as new elements ramp up the difficulty. Red blocks, for example, provide a temporary base for your parcel that explodes after a few seconds of use. Purple cubes send you flying along a tightrope and standard blocks fitted with arrows move you on in a set direction automatically.

It's a very steady way of taking a simple idea and expanding it gradually to create something much more diverse.

Rotorumpus wisely courts you on its basics before thrusting incomprehensible challenges upon you. How every game should be made, you might think, but so many get it wrong. It's the equivalent of a first day as a courier with a pack of deliveries in tow, but without the addresses or maps needed to find your way.

Rotorumpus conversely manages to introduce a new style of play with a fair dose of patience and a whole delivery van full of class (the music, in particular, is a high point). Ironically enough, this is one simple star that might need to complicate its foundations a little in order to become the real hot package it deserves to be.